Rice hispa [Dicladispa armigera (Olivier) (Chrysomelidae: Coleoptera)] is a major rice pest in Bangladesh. Adults feed on the green tissue of the leaf blade externally and grubs are leaf miners. Rice hispa (RH) prefers young rice plants, but, in their absence, it also attacks maturing plants. Some reports estimate time- and space-specific damage ranging from 14% to 62% yield losses from RH (Alam 1977, Karim 1987, Islam 1989, Chatterjee and Bera 1990, Nath and Dutta 1997). However, the relationship between damage level and grain loss is not clear. Therefore, we carried out several experiments at BRRI under irrigated conditions in the 1999 aus (summer rice) and transplant aman (monsoon rice) seasons.